Today I quit a threshold ride. I was chugging along, struggling but I was in a decent place to finish, had to pee, got off my bike and saw water leaking in my basement. Motivation shot! No big deal. I’ve had a great week on the bike, stuff happens. However, I still had some juice in the legs. I just didn’t have go hard juice. In terms of milking the time and training value and the TR FTP algo, would it have been better to just finish the ride at a lower intensity or perhaps do 30 endurance minutes? Or, is call it a day after 52 minutes the “right” thing? What do you all think?
I wouldn’t have worried about it one way or the other…sometimes life happens.
Do what you feel like at that point and just skip any recommended plan adjustments as a result of the ride.
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As @Power13 mentioned, I would not worry too much about it as life happens sometimes 
If you are struggling then it may be wise to lower the intensity to finish the workout. But if you are really struggling it may be even wiser to end the workout at 52 mins.
Either way, one workout won’t be a deal breaker for AI FTP Detection. Just make sure to answer the Post Workout Survey accordingly and accept any adaptations you are receiving.
The adaptations are meant for a reason, as the system knows by the workout data if you struggled or not. Any time I would recommend not accepting them is if you failed to complete the workout due to something external like equipment issues, or having to attend to family matters, etc…
I have no answers, but I run into that too. My legs are good but my motivation just isn’t there, so I bail. I’ve done that on workouts on the trainer but also on actual outside free rides. At that point, I just need to take some time off and take the fitness hit. Sometimes it’s a few days, sometimes a few weeks. On a couple of occasions, it’s been a few months.